William g



(No Model.)

W.` G. RAU. .ADJUSTABLE FLUE STOPPER.

No.l 513,141. Patente'd'Jam 23, 1894.

UNITED STATES PATENT OFFICE.

WILLIAM G. RA'U, OF LOUISVILLE, KENTUCKY, ASSIGNOR TO RAU BROTHERS,

OF SAME PLACE. i

DJUSTABLE FLUE-STOPPER.

SPECIFICATION formng part of Letters Patent No. 513,141, dated January23, 1894.

Application filed .Tune 15, 1893. $erial No. 477,774. (No model.)

To all whom it may ooncern:

Be it known that I, WILLIAM G. -RAU, of Louisville, in the county of Jefferson and State of Kentucky, have invented new and usefulImprovements in Adjustable Flue-Stoppers, of which the following, takenin connection with the accompanying drawings, is a full, clear, andexact description.

This invention relatesto improved devices for closing chimney-flues whenno stove-pipe is held in the same, and consists in certain details ofconstruction and operation of parts all as hereinafter more fully setforth, and specifically pointed out in the claims.

In theannexed drawings similar letters of reference denote correspondingparts in all Views, wherein- Figure 1 is an edge View of the device withthe curved arms drawn in to their limit of movement. Fig. 2 is a sideview with the armsv in the same position. Fig. 3 is a partial plan viewinverted in which the cover or shield cap is partially broken away, andFig. 4 is a side view wherein the curved retaining arms are projected totheir full limit of outward movement.

The face plate --A- is preferably circular in form, though any formwhich will answer to shield the stove-pipe opening will answer thepurpose, andv the form of said face-plate is immaterial.

-B-- is a bifurcated base-piece held to the interior side of the facepieceby'means of the flat headed rivet --b-- under which it passes toretain it in close contact with the interior of the face plate --A-.vRising from the base -B-=- is a riser --C- which has a longitudinal slot--C'- extending almost its entire length, while the swivel -fE- issecured to said riser by means of the screw or rivet -e-- passingthrough said slot -O'fi to secure said swivel hl-'- in position on saidriser, and said slot is provided so as to permit vsaid swivel to movefreely along the length of said riser for the purpose hereinafterexplained.

At the exterior of the face-plate --A-- is a thumb nut -G-- which isconnected to the threaded bolt -F-- so as to control said bolt in itsrevolution through the movement of said thumb-piece -G At the inner sideof the face-plate is a swivel -E riding on said bolt fiF- and having aninternal screw.- thread coinciding with the thread of said bolt,

and pivotally connected to the said swivel' -E- is a pair of curved arms-D--D-,- passing through guides --c'- in the turned up portion -O"- ofsaid riser 0- formed integral with said riser -C-.

In operation my device works as follows: When it is desired to insertthe device in position in a stove-pipe opening the arms -D- areprojected into said opening and the facepiece -A-- is setup snuglyagainst the face of the wall. turned in the proper direction to causethe swivel E- to travel along the line of the screw-threaded bolt --F--until it has reached such position as will cause the outer ends of saidarms --D- to impinge against the inner face of the flue-opening where itwill be desirable to screw the said arms sufiiciently far to cause apositive lock of the parts to hold the face-piece --A- in position. Thebase B- being slotted as shown enables the parts to be readily assembledfor use and permits of ready separation for the purpose of packing forshipment or storage if desired, for by merely unscrewing the bolt --F--from its engagement the base-piece may be readily withdrawn from itsposition and the parts may be packed flat if desirable. Added economy ofmanufacture results from the form given the base piece --B-- as it andthe riser--O- may be of a single piece of Sheet-metal bent into form asshown in the drawings thus permitting the manufacturer to secure thefacepieces cut to proper Shape and secure thereto the riser ---C-- andits connections at will upon making a slight opening in the facepiecefor the passage of said bolt --F-.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. In a device of the described class, a pair of sliding expansion arms,a swivel-block to which said arms are pivotally connected and aprojecting screw adapted to move said The thumb-piece -G- is then 65swivel in a right line along its length, sub' inner ends of said armsare connected, all in stantially as speoified. combination substantiallyas specified. ro

2. In a device of the described character, a In testimonywhereof I havehereunto set face-p1ate,a thumb-piece on the external face my hand this25th day of February, 1893.

5 of said face-plate, a screW-threaded bolt pro- WILLIAM G. RAU.

jecting inwardly therefrom, a guide-plate, a Witnesses: pair ofexpansion arms sliding in said gnide- FREDERICK H. GIBBS,

plate and a swivel on said bolt to which the W. C. LYON.

